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PL28828890A1990-12-141990-12-14Method of burning through tapping holes in closures of metal or slag tapping openings of metallurgical furnaces
PL288288A1
(en)
Method of producing pig iron, non ferrous metal alloys, ferrochromium carbides or carbon-free ferrochromium and synthetic blast furnace slag using residues of incinerated waste or slag containing metal oxides